Water-tube steam-boiler.



No. 791,314. I PATENTED MAY 30, 19051 J. D. BOWNE. I

WATER TUBE STEAM BOILER.

APPLICATION FILED JULY 6, 1904.

N NIBERLQY Fi,r3-l

Patented May 30, reps.

PATENT OFFICE.

JOHN D. BOWNE, or NEW YORK, N. Y.

WATER-TUBE STEAM-BOILER.

SPECIFICATION forming part of Letters Patent N0. 791,314, dated May 30,1905.

Application filed July 5, 1904. Serial No. 215,260.

To all whom it may concern:

Be it known that 1, JOHN D. BOWNE, a citizen of the United States,residing at New York, in the county of New York and State of New York,have invented certain new and useful Improvements in Water-TubeSteam-Boilers, of which the following is a specification.

My invention relates to water-tube steamboilersthat is to say, itbelongs to the general class of steam-generators wherein the Water issubjected to the heat of the furnace while circulating through series oftubes.

Among the numerous boilers possessing the structural. nature statedthere are many in which the tubes are disposed substantially in verticaland horizontal attitudes,a nd numerous examples comprise series eachhaving a single perpendicular tube or riser connected to a plurality orhorizontal tubes. In this manner many tubes are arranged directly acrossthe path of the hot products of combustion from the furnace and theheating-surface increased so far as may be deemed desirable just wherethe heat is most effective. The risers are not directly subjected tothe'current of the burning gases, and a single riser is made to serveseveral cross-tubes. Obviously the circulation in the single verticaltube is more rapid than in the several crosstubes, the greater area ofthe combined horizontal tubes enabling the water to move more slowly,thus giving more time for the heat to of water-tube boiler that myinvention par- .ticularly belongs, and the object of the invention is toproduce a special arrangement of the tubes that will afford large directheating-surface for minimum weight and number of tubes.

I accomplish the object set forth by forming and associating the partsas illustrated in the accompanying drawings, of which- Figure 1represents a front end view or elevation, and Fig. 2 a side View.

Like letters are used to refer to the same parts throughout thedrawings.

The base of my invention upon which the various parts are erected and bywhich the whole structure is supported consists of heavy trunk-pipes Aand B, arranged parallel to each site side of the boiler.

other and connected at the rear by a shorter but similar pipe C, thethree pipes constituting the three sides of a retangle. A suitable grateis designated by the letter D.

The trunk-pipes A and B are manifolds and each possesses a row ofthreaded openings into which are screwed the risers E. The series oftubes are arranged one in rear of the other, and assuming the firstriser E to be connected with trunk or base manifold B the riser of thenext succeeding series will be coupled with trunk or base manifold A onthe oppo- As each series of tubes is precisely the same in constructionas all the others,.an explanation of the first series will cover anynumber used. At a suitable distance above the grate D the first riser Ewill be seen. to engage a T,(marked by letter F.) The T is connectedwith aseries of horizontal tubes G, the ends of which are connected witheach other by return-bend caps H. In Fig. 1 of the drawings thehorizontal tubes form a flattened S, but I do not limit myself to threehorizontal tubes in each horizontal series, as a greater number of tubesG may clearly be employed. The uppermost tube G of the lower S-shapedseries is connected by way of an elbow J and short tube K through anupper T (marked L) and thence by vertical and horizontal tubes M and Nwith the drum P.

The upper T, (marked L,) it will be noted, is found upon the oppositeside from that of the lower T (marked F) of the series of tubes, and asecond and upper S-shaped series of horizontal tubes G is connected withthe upper T. The lower tuloeG of the upper S- shaped series ofhorizontal tubes is coupled by way of the elbow Q and a short tube Rwith the lower T (marked F) and already referred to.

At the rear the drum is connected with the cross-pipe G by thecirculation-pipe S, vertically disposed.

In operation the water rises from the side base manifolds A and B,flowing rapidly through the risers E and upper tubes M and N; butrelatively slowly through the horizontal tubes Gr, wherein it is exposedto the hot gases from the furnace, heat from which it takes in to themaximum extent. After passing through the drum the water is returned atthe rear by Way of circulation-pipe S.

Having thus described my invention, the special arrangement of tubes ina water-tube boiler claimed by me is In a Water-tube steam-boiler, thecombination with a steam-drum, of base trunk-pipes,

an upper vertical tube upon one side of the boiler connected with saiddrum, a lower vertical tube upon the opposite side connected with one ofsaid base-pipes, an upper series of horizontal tubes connected at oneend with an intermediate point of said upper ver- 3 JOHN D. BOWNE.

Witnesses:

AUG. T. WILLINK, C. E. Gooems.

